Скачать или смотреть How to Select Child Nodes in VTD-XML Using XPath

Learn how to filter XML nodes and create branch objects in Java using VTD-XML and XPath expressions.
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Navigating XML with VTD-XML: Selecting Child Nodes

When working with XML data, especially in a structured format like school records, you may find yourself needing to filter specific nodes based on certain criteria. In this guide, we will explore how to achieve this functionality using VTD-XML, a fast XML parsing library for Java, along with XPath expressions.

Understanding the Problem

Let's say you have some school data structured as an XML file. The XML format contains various school records, each with their own details including branches and their types. A sample structure may look like this:

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Given an XML structure like this, your goal might be to:

Filter out schools based on a condition (e.g., their ScId starts with "RC").

Iterate over the filtered results and create objects associated with their branches based on their type.

The Solution: Using VTD-XML with XPath

Step 1: Setting Up Your Environment

Make sure you have the VTD-XML library set up in your Java project. You'll also need to import necessary classes:

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Step 2: Parsing the XML File

You'll first need to parse your XML file and prepare for navigation. Here's how to do that:

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Step 3: Selecting Schools Using XPath

Your first XPath expression will filter schools where the ScId starts with "RC":

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Step 4: Iterating Over Schools and Branches

Now that you have selected the appropriate school nodes, use a loop to iterate through them and then select branch nodes. To do this effectively with VTD-XML, you can push and pop the navigation context.

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Step 5: Creating Branch Objects

Within your loop, create branch objects based on the information retrieved from the XML. Here is an example of how to structure the Branch class:

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Conclusion

With these steps, you can effectively use VTD-XML and XPath to filter and navigate through XML data. This solution aids in creating child objects based on given conditions, facilitating structured data handling in your Java applications.

Feel free to reach out with your questions or to share your experiences in handling XML with VTD-XML.